The other item inside of Facebook that you have to be careful with is going to be the last click attribution model, which is the same for Google Analytics. The reason for caution is that you should be in Facebook building funnels. A funnel: this is the first thing that they see, then this is the next thing they see, and the next thing, and the next thing, and the next thing. So, a lot of your credit or your conversions, phone calls, form fills will be given often to the remarketing ad. And that makes it difficult to know if your ads prior to that stage are providing value.
So you might have to look at different metrics than conversions.
Are you getting people to watch the video, which is building a remarketing audience, in which you are now trying to get landing page views? And then from the landing page views, are you then getting the conversions in the remarketing?